A-LevelPhysicsWavesOct/Nov 2016Paper 1 Q291 Mark
A microwave transmitter is placed at a fixed distance from a flat reflecting surface, as shown. [Figure 29.1] A microwave detector is moved steadily in a straight line from X to Y. A series of maxima and minima of intensity is obtained. The distance between adjacent maxima is 1.5 cm. What is the frequency of the microwave radiation?
A1.0 × 10⁸ Hz
B2.0 × 10⁸ Hz
C1.0 × 10¹⁰ Hz
D2.0 × 10¹⁰ Hz
✓ Correct Answer
The correct answer is C: 1.0 × 10¹⁰ Hz
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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